List of top Chemistry Questions

Refractory metals are used in construction of furnaces because
Relative decrease in V.P. of an aqueous solution of NaCl is 0.167. Number of moles of NaCl presentin 180 g of $H_2O$ is
Reductive ozonolysis of benzene produces
Reductive ozonolysis of o-xylene gives
Red phosphorus and hydrogen iodide reduce carboxylate ions to
Red phosphorus is less reactive than yellow phosphorus because
Reduction of aldehyde with HI and P give
Recognise the figure and find out the correct matching.
Read the passage given below and answer the question The hydrogen-like species $Li^{2+}$ is in a spherically symmetric state $S_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $S_2$. The state $S_2$ has one radial node and its energy is equal to the ground state energy of the hydrogen atom. Energy of the state $S_1$ in units of the hydrogen atom ground state energy is
Read the given statements and select the correct option. Irrigation without proper drainage of water leads to waterlogging in the soil. Waterlogging draws salts to the soil surface, which are deposited as a thin crust on the land surface or start collecting at the roots of the plants.
Read the following statements and identify the incorrect statement.
Reaction that takes place at graphite anode in drycell is
Reaction $ {CH_3CONH_2 ->[NaOBr] }$ gives
Ratio of number of oxygen atoms in $Ca_3(PO_4)_2$ and $H_3PO_3$, if both contain same number of $P$ atoms, is
Reaction of $C_6H_5CH_2Br$ with aqueous sodium hydroxide follows___________.
Ratio of difference of spacing between the energy levels with $n=3$ and $n=4$ and the spacing between the energy levels with $n=8$ and $n=9$ for a hydrogen like atom or ion is
Rate law for the reaction, $A+2B$ $\rightarrow$ $C$ is found to be Rrte $=k\left[A\right]\left[B\right]$ Concentration of reactant $??'$ is doubled, keeping the concentration o f $???
Random motion of colloid particle is known as
$R-OH + HX \rightarrow RX + H_2O$. the reactivity of alcohols is
Quartz is an example of
Quartz is the crystalline variety of
Quasi-fluid nature of membrane is due to
Pyrosilicates are the silicates in which twotetrahedral units are linked at
Pyrex glass is a mixture of
Pyrolusite is an ore of